Rebalance failed....replicator_died

test attempting to do rebalance after loading data:

2012-04-16 14:36:32,559 - root - INFO - adding node 10.2.2.63:8091 to cluster
2012-04-16 14:36:32,559 - root - INFO - adding remote node : 10.2.2.63 to this cluster @ : 10.2.2.60
.....
2012-04-16 14:36:53,918 - root - ERROR -

{u'status': u'none', u'errorMessage': u'Rebalance failed. See logs for detailed reason. You can try rebalance again.'}

- rebalance failed

from diags:

Warning: failed to set data, cannot locate database file /opt/couchbase/var/lib/couchdb/bucket-0/20.couch
Persisting ``15537-1f3a9de7-989d-4bcf-a0ef-719a7ebb7e62'' on vb20 (rowid=-2) returned 0 updates

Warning: failed to set data, cannot locate database file /opt/couchbase/var/lib/couchdb/bucket-0/20.couch
Persisting ``15563-7000697f-06a5-4c08-baea-bccfc0505151'' on vb20 (rowid=-2) returned 0 updates

...

2012-04-16 17:37:05.504 ns_orchestrator:2:info:message(ns_1@10.2.2.60) - Rebalance exited with reason {exited,
{'EXIT',<0.31746.0>,
{replicator_died,
{'EXIT',<19784.5907.0>,
{badmatch,{error,closed}}}}}}